Limiting surface pressure under the nut

Symbol pGMu
Unit N/mm²
Attribute-ID vdi_2230_limiting_surface_pressure_of_the_nut
Numeric ID 19222
Value Type PMTechValue

The limiting surface pressure under the nut pGMu results from the material of the adjacent plate. It is used to determine the safety against surface pressure in the assembly state SPG and operating state SPB (R10).

Material group Material symbol Material number Tensile strength
Rm,min
[N/mm2]		 0.2% proof stress
Rp0.2min
[N/mm2]		 Shearing strength
τ​Bmin
[N/mm2]		 Limiting surface pressure
pG
[N/mm2]		 Young's modulus
E
[N/mm2]		 Density
ρ​
[kg/dm3]		 Coefficient of thermal expansion
α​T
[10-6 K-1]
Plain structural steels S235 JRG1 1.0036 340 230 290 490 205000 7.85 11.1
E295 1.0050 470 270 380 710 205000 7.85 12.5
S355 JO 1.0553 490 325 390 760 205000 7.85 12.6
Grain-refined structural steels S315MC 1.0972 390 315 420 540 205000 7.85 12.6
S420MC 1.0980 480 420 370 670 205000 7.85 12.5
Low-alloy tempering steels (heat-treated) Cq 45 1.1192 700 430 460 770 205000 7.85 11.1
38 MnSiVS 5-BY 1.5231 900 600 580 990 205000 7.85 11.5
34 CrNiMo 6 1.6582 1100 900 720 1430 205000 7.85 11.5
37 Cr4 1.7034 850 630 720 1105 205000 7.85 11.5
16 MnCr 5 1.7131 1000 850 850 1300 205000 7.85 11.5
42 CrMo 4 1.7225 1000 750 660 1300 205000 7.85 11.5
34 CrMo 4 1.7220 900 650 590 1170 205000 7.85 11.5
Sintered metals SINT-D30 - 510 370 300 450 130000 7 12
Austenitic CrNi steels X5 CrNi 18-10 1.4301 520 210 410 630 200000 7.9 16
X4 CrNi 18-12 1.4303 500 220 400 630 200000 7.9 16
X 2 CrNi 18-9 1.4307 520 200 410 630 200000 7.9 16
X5 CrNiMo 17-12-2 1.4401 530 220 410 630 200000 8 16
X6 NiCrTiMoVB 25-15-2 1.4980 960 660 670 1200 211000 8 17
Nickel-base alloys NiCr20TiAl 2.4952 1000 600 650 1000 222000 8.22 13
MP35N - 1580 1480 970 1500 235000 8.35 11.2
Cast iron GJL-250 0.6025 250 165b) 290 850 110000 7.2 11.7
GJS-400 0.7040 400 280b) 360 600 169000 7.2 10
GJS-500 0.7050 500 350b) 450 750 169000 7.1 12.5
GJS-600 0.7060 600 420b) 540 900 174000 7.2 12.5
GJV-300 5.2100 300 210 270 480 137000 7.1 11
GJV-500 5.2301 500 350 450 950 152000 7.1 11
Wrought aluminum alloys AlMgSi 1 F28 3.2315.61 260 200 150 325 75000 2.7 23.4
AlMgSi 1 F31 3.2315.62 290 290 170 360 75000 2.7 23.4
AlMg4,5Mn F27 3.3547.08 260 260 150 325 75000 2.7 23.7
AlZnMgCu 1,5 3.4365.71 540 540 330 540 75000 2.7 23.7
Cast aluminum alloys G-AlSi9Cu3 3.2163.01 160 100 85 200 75000 2.75 21
GK-AlSi9Cu3 3.2163.62 180 110 95 225 75000 2.75 21
GD-AlSi9Cu3 3.2163.05 240 140 125 300 75000 2.75 21
G-AlSi7Mg0,3 3.2371.61 230 190 120 290 75000 2.75 22
GK-AlSi7Mg wa 3.2371.62 250 200 130 310 70000 2.65 22
G-AlSi10Mg 3.2381.01 220 180 115 275 73000 2.75 22
Magnesium alloys GD-AZ 91 (MgAl9Zn1) EN-MC21110 200 150 120 280 45000 1.8 27
GK-AZ 91 -T4 - 240 120 140 290 45000 1.8 27
GD-AS 41 (MgAl4Si) EN-MC21320 190 120 120 230 45000 1.8 27
Titanium alloy TiAl6V4 3.7165.10 890 820 600 1340 110000 4.43 8.6

b) 0.1% proof stress

Note: All numerical values are short-term values at room temperature and have to be considered as guide values. In the specific instance it may come to deviations due to a large number of influencing factors (geometry, relaxation, etc.).

Table from: VDI 2230 Part 1, VDI Verlag Düsseldorf, 2015, p. 122/123, "Table A9. Selection of materials for bolted components – guide values of mechanical and physical properties."